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nomodeset
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GRUB_CMDLINE_LINUX_DEFAULT
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/etc/default/grub
Now my system runs almost okay but there are some graphics-related issues like screen tear, the computer not suspending properly from time to time* and the fact that it's always using the Nvidia GPU (because of the Optimus technology) and that's taxing on the battery. Considering I don't use my laptop from graphics intensive work I decided I would be perfectly fine using the Intel card exclusively so I changed it form the NVIDIA X Server Settings. And here lies my issue. After doing that I couldn't log into my account - the screen would just freeze after I had entered my credentials and hit enter. Also, after some time (1-2 minutes) one of my laptop fans suddenly starts spinning quite fast in a way that normally doesn't happen (it was also quite loud). I managed to bring back everything into a stable state by logging into TTY1 and switching the selected graphics card from there.
Do you know of a way I can disable the Nvidia card? My BIOS doesn't support that option and I read about Bumblebee but I'm somewhat scared of using it since I wouldn't be sure what to do if I'm once again locked out of my system and my fan goes crazy.
* Here are some images of the screens I sometimes get after attempting to suspend (please excuse the poor quality, my phone's camera is not good and neither are my photography skills):